Steam-engine.



No. 734,816. PATBNTED JULY 28, 1903.

M. CASTELNAU.

STEAM ENGINE.

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No. 734,816.. PATENTED JULY 2a, 1903. M. GASTELNAU.

STEAM ENGINE.

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steam blasts do not strike one against the Patented July 28, 1903.

FFICE.

P T NT MAROELLIN CASTELNAU, OF PARIS, FRANCE.

, STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 734,816, dated July 28, 1903.

' Application filed October 23. 1902. Serial No. 128,376. (No model.)

' boiler producing normally: and without any risk steam at a pressure of over fortykilograms. sure has hitherto been rendered impossible for several reasons, among which I may mention particularly the excessive Wear of stuffing-boxes and the high temperature of the cylinder-wallinjuring the lubrication.

The present invention has for its object to provide a steam -engine so arranged as to avoid the objections arising from the excess ive temperature of the steam and to allow in practice the use of steam at a pressure of over forty kilograms. To 'obtain this result, the said machine is so arranged as to do away with the stuffing-boxes of piston-rods and to cool the cylinder internal wall by the direct contact of the exterior-air. It comprises a cylinder, having a partition in the middle and open at both ends, slidably mounted on two pistons fixed to the main frame. Through the said pistons are provided ducts for the inlet and outlet of the steam, each duct exclusively serving for the inlet and outlet, so that during the high speeds of the engine the other in the ducts. The reciprocation of the cylinder relatively to the pistons takes place under the action of the steam distributed alternatively between the saidpistons and the partition of the cylinder, the distribution being efiected by means of any suitable distributing mechanism.

The accompanying drawings represent a diagram of one form of the invention.

Figure 1 is a vertical sectional view of an engine embodying my improvements, taken on the line of the cylinder-axle and in part following the line of theadmission-valves.

The use of steam at such a pres provided in the fixed piston-rods.

Fig. 2 is a partial vertical sectional view on the line of the'exhaust-valve, and Fig. 3 is a plan view of the top of the engine;

The machine comprises a movable cylinder 1, slidable on two fixed pistons 2. The said cylinder is open at both ends and divided in its middle by a partition 3. Two wrist-pins 4, formed on the cylinder, are connected by rods 5 with the cranks 6 of the driving-shaft 7 to transform into a rotary movement the reciprocation of the cylinder. An eccentric 8, mounted on the driving-shaft '7, operates through the medium of the levers 9 9 and the link 10 two rock-shafts 11, which actuate the valves 12 for the inlet and the valves 13 for the outlet of the steam. The latter passes in to the cylinder through the channels 14 and out of the cylinder through the channels 15, It will be seen that this arrangement allows of doing away with the stuffing-boxes of the piston rods. At each travel the inner wall of the cylinder beyond the fixed'piston comes in contact with the exterior air and is cooled thereby.

In order to insure an absolutely rectilinear movement of the cylinder 1, the interior of the main frame is provided with longitudinally-extending grooves adapted to receive and seat splines or projections formed on the exterior wall of the cylinder, the pistons being thereby relieved of considerable wear.

I claim- 1. An engine comprising a main frame having a groove therein, piston-rods mounted on said frame, pistons fixed on the rods, a cylinder slidingon said pistons, a spline on the cylinder fitting in the groove of the frame,

means for introducing a motive charge to the cylinder,and means for exhausting the charge from said cylinder.

2. An engine comprising a main frame, piston-rods mounted on said frame, pistons fixed on said rods, a cylinder open at both ends and sliding on said pistons, a segmental packing for the pistons, inlet and outlet ducts for the motive charge formed in the pistons, and

ton-rods mounted on said fraine, fixed pistons I my invention I have signed my name in preson said rods, a cylinder open at its ends and I ence of two subscribing witnesses. sliding on said pistons, and on each piston- I rod two distinct steam-ducts, one exclusively MABOELLIN CASTELNAU' 5 serving for the inlet and the other for the Witnesses:

MAURICE RoUX, 1

outlet.

In testimony that I claim the foregoing as EDWARD P. MAOLEAN. 

